Connection for running arc-lamps.



W. SGHAPFBR.

CONNECTION NOR RUNNING ARG LAMPS.

I APPLICATION FILED JAN. 13, 1910.

Patented July 9, 1912.V

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WALTER-SCEFFEE, 0F BERLN, H' =l CONNECTION ron nUNnrNc il Y' resaca?.

Specification of Letters Patent.

Patented July 9, is.

T Application led January 13, .1919 ra-1 N0 5373321- To all 'whom 'it may concern:

Be it known that I, WALTER SGHFFER, engineer, a subject of the Emperor of IGrermany, residing at Geisbergstrasse 29, Berlin, Germany, have invented certain new anduseful Improvements in or Relating to Connections for Running Arc-Lamps, of, which y l.

device, inwhichthe following is a specification.

My invention relates to connections for: running are lamps, 1n which the series rey sistance of the arc lamps 1s wholly or pa-rtially formed by incandescentlamps in series withregulating resistances, and the primary object is to provide a resistance wherein an electrolyt-ic cell battery is connected in series with the arc lamps and also in parallel with the circuit containing one or more regulating resistances and incandescent lamps.

' When it is desired to substitute the series resistances of the arc lamps entirely or partly by incandescent lamps, to avoid the waste of energy of a series resistance, provision must be made so that the arc lamps will be freely subjected to the necessary luc- ,in 110 volt system, the latter being especially important in modernd lighting plants. For the above noted protective purpose a resistance may be used, the value of whichv varies automatically with the current, and may be in the form of a regulating resistance such as iron wire resistances. These resistance regulators may be connected in series with the incandescent lamps, but cannot be merel-y connected together with the incandescent lamps in series with the arc lamps, because the are lamps will be then deprived of the action of the liuctuations of current that are necessary for their regulation.

, .According to my invention l provide a special arrangement for supplying the arc lamps with the variations of current necessary 'for their regulation. This arrangement consists in connecting in' series with the arc lamps an electrolytio cell battery connected;

. in parallel in a circuit comprising the-regulatiuig l.resistances and incandescent lamps. When the lamps burn normally very little regulate, the corresponding variations in current take place in the battery circuit and flow through the saidV battery circuit tothe arc lamps Without inuencing the incandescent lamps. l

In the accompanying'drawings are diagrammatically Shown .embodiments of my Figure 1 is one form of my device, Fig. 2 shows the same connected to a lighting plant, Fig. 3 is a modified arrangement, and Fig. l shows the various operating positions of the switch.

Referring to Fig. Il, a and e denote the terminals of a feeder system, b designates a battery of electrolytic cells, o and d represent are lamps, f indicates an incandescent lamp circuit, and g an iron wire resistance termed a regulating resistance. The battery and arc lamps are connected in series, and the incandescent lamp circuit is connected in series with the regulating resistance to the terminals of the battery. It the diiference of potential between the terminals of the battery is 110 volts and if each arc lamp 'requires 4() volts, l employ a line having a other hand, from this maximum amount downward the electrolytic cell tension is eX- ceedingly unstable. When changes occur in an arc an optionally strong current, limited by the cutfout of .the system, can flow through the cells to the arc lamps and thus cause them to be. regulated rapidly. The above holds goed for Starting the arc lamps after the carbonshave contacted with one another for a moment and a strong current iows. The incandescent lamps connected in parallel with the battery are'obviously not exposed .to a current stronger than the normal. L'

Referring new to Fig.. 2, a vstarting resistance l1., having a switch lever c', causes the arc lamps to be sle'wlyv cut in, and is in se- 'plied byl internal resistance, and that, on the furie acid, become coated with a layer of sulfate when the battery has not been working for along time. When cutting the bat- 5 tery 1nto circuit this insulating sulfate layer must ybe destroyed, which operation cocu--A pies an exceedinglyshort time, usually less than a second, but nevertheless mi ht cause trouble if the hereinbefore describe connections were made at once when cutting in the battery. In such cases I employ the connection shown in Fig. 3. 'In this connection, the layer of sulfate is automatically broken down without the incandescent lamp circuit being affected by the increase of potential. I attain this end by providing an ordinary resistance and arranging the switch for the -lighting plant in such a mannerthat before the final working connection is made', this resistance, in parallel with the electrolytic cell battery, is :connected in series with. Vthe arc lampsl I also employ the resistance during the starting period'of the arc lamps by connecting the resistance only in series strong current which -ows when the lamps great as to blow out the series' fuses.

Fig.- 3 diagrammatically shows an entire plant arranged after the above mode of 'connection, with the switch v`in its operative position,fand Fig. 4 shows on an'enlarged scale the individual positions ofthe switch' when connecting the lamps into circuit. 'In these. igures a and e designate the terminals of the source'of current s, c and d arc lamps, 6 designates an ordinary starting resistance, b

an. electrolytic cell battery comprising eight cells, f incandescent lamps, and g regulating resistances, .instead viously provide a singlev regulating-resistance in series with each incandescent lamp or group. ofthe same. The switch lever 7 ihas a forked contact, as clearly shown.

positioned so vlthat its contact is on the contacts 10 and 11 together. The -current then flows from terminale by'way of'feeder 15 The arrangement is such that when cutting the lamps into circuit, the above mentioned events occur as shown by the individual positions of the switch lever in Fig. 4. In the cut-out position the forked contact of the switch lever ison the rest contact 12 of the switch, corresponding to position I in Fig. 4. For startin the contact is placed on contact 13, ass ownl in position with the arc lamps. By this method the of which I might ob' When working normally theswitch lever is c, and feeder 14- to II; the electrolyticl cell battery and the incandescent lamps f, together with the regu- Alating resistances g, arel notin circuit.V The current' owing, when the am lamps start,

passes through the standard starting resistance 6. In position III the switch lever 7 connects contacts 10 'and 13. Battery b is then connected' in parallel with resistance 6.

In theevent-of the lead plates having bev comesulfated, the layer of sulfate is removed, or at least diminished, by the current which iiows through it. Onthe other hand,`

in position III thev battery has time to obtain a corresponding counter-electromotive force. The switch lever is then shifted to position IV. In this position the forked contact of lever-7 connects contacts 10 and 11 and the battery is'then in parallel connection with the incandescent lamp circuit, the same being in series with the arc lamps. The illustration IIIshows the intermediate position vof lever-7 between positions III and IV.

The forked contact of the lever should/be so broad that itjust leaves contact 13 as it engages with contact 11, so vthat any possible engagement of contacts 13, 10 and 11' canA only exist for a very shortl period of time during the movement of the'switch lever.

Thus the forked contact never, remains on contact 10 alone, but always. on contacts-10- ting the ,plant out of circuitthe switch lever 7 must be returned so that its forked conf tact is again on the rest contact 12. In this position the battery b is not connected-with either the incandescent lamp circuit or the resistance, butis cut out of circuit entirely. Therefore, it maintains for a long time its electromotive force, which, as is well known, opposes theA formation of sulfate.

Iprefe'rably make switch'lever 7 so that in the positions I, II, III and IV it snaps into placeunder the action of a sprlng, so that these positions are readily found and the lever does not remain on the intermediate positions. When l being switched .from contact 13 tov contact 12.7the motion ofthe switch lever is also accelerated by the force of the spring so that the contact of lever 7 is prevented from remaining a short distance 'away from contact13, thereby making it impossible-for an arc to be maintained between contacts 13 and 7.

Instead of connecting all the incandescent lamps in series with one and the same resistance regulator, I may employ a pluralit of the latter connected in serles or paralle or individually'l in` series withincandescent lamps. lTwo regulating resistances are shown connected in parallel way of example.

1. An electric lighting system for the running ofare lamps, inv which the reducing in Fig. a by- 95 and 13 or on contacts 10 and 11. For cutrheostat of the arc lamp is formed by incandescent lampsin series with a resistance regulator, and has a battery of electrolytic cells connected into the circuit in series with the arc lamps and in parallel connection with the circuit containing the said resistance regulating means and the incandescent lamps.

2. In an electric lighting system of the character described, the combination with feeders and arc lamps in series therewith, of a circuit comprising one or more resistance regulators and a group of incandescent lamps in series therewith normally interpolated in one of said feeders in series with said arc lamps, and a battery of electrolytic cells normally connected in parallel with said circuit and in series with said arc lamps, a starting resistance electrically connected with said arc lamps, said battery and said circuit, and a switch connected to one of said feeders for connecting solely said resist-ance in series with the arc lamps and -subsequently connecting 'the same in parallel with and disconnecting the same from said battery.

3. In an electric lighting system of the character described, the combination of a feeder, a switch lever connected therewith, a rest contact and three operative contacts (13, 10, 11) adapted to be cont-acted by said lever, an arc lamp line, a resistance connected between the latter and the rst operative contact (13), an incandescent lamp circuit comprising one or more resistance regulators in series with incandescent lamps connected with said line and the third operative contact (1l) electrolytic cells connected with the second operative contact A(10) and with said line, the. arrangement of said operative contacts being such that when the switch lever contacts with the second operative contact one of the other operative contacts is always simultaneously contacted thereby.

In testimony whereof I have signed my name to this specification in the preesnce of two witnesses.

WALTER sci-ritirata.

Witnesses WOLDEMAR HAUPT,

HENRY IIAsrER. 

